Source: The Great Interpretation of Dreams (Ibn Sirin)
The willow tree in a dream indicates a man of amusement and entertainment, or indicates worry, sadness, and mourning.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Willow indicates a man with no religion or a wailing woman.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Willow is interpreted as worry and sadness.